XBELHeader xh = new XBELHeader();
List<String> authors = source.getAuthors();
if (hasItems(authors)) {
XBELAuthorGroup xag = new XBELAuthorGroup();
List<String> xauthors = xag.getAuthor();
for (final String author : authors) {
xauthors.add(author);
}
xh.setAuthorGroup(xag);
}